Minutes after two bombs exploded near the finish line of the Boston Marathon at 2:50 p.m., reports started rolling in. We began this post soon after, with chronological updates continuing through the evening. Some photos might be graphic.

Boston PD commissioner Ed Davis confirms there was a third incident at the JFK Library, several miles from Copley Square. There were no injuries. (A library spokesperson says it was a fire in the mechanical room.)

From the AP, a spectator tries to find a friend after the marathon was canceled:

Via Eric Twardzik, a photo taken around 5:30 of a man being handcuffed on the Boston Common. Twardzik says he's wearing a white baseball cap:

In a 6:00 press conference, the police commissioner says the fire at the JFK library appears to be unrelated to the marathon blasts.

The Post has been reporting that a potential suspect is under guard at a Boston hospital, citing "federal officials." Police Commissioner Davis seemed to dismiss that, saying BPD had no one in custody. NBC News now reports on a "possible suspect" who was injured in the blast. It's worth noting that neither the Post nor NBC had claimed anyone was arrested.